Mixing-machine.



PATENTED SEPT. 1, 1908.

W; 0.. STARK. MIXING MACHINE. APPLIQATION TILED 11110. 18, 1905.

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No. 897,313. PATENTBD SEPT. 1, 1908. w. 0. STARK. MIXING MACHINE.

APPLICATION FILED DEG.18, 1905.

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No. 897,313. PATBNTED SEPT. 1; 1908.

W. 0. STARK. MIXING MACHINE.

APILIOATION FILED D3018, 1905.

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ms NORRIS PETERS co wasmusron u c UNITED STATES PATENT OFFICE. v

WILLIAM O. STARK, OF CHICAGO, ILLINOIS, ASSIGNOR TO FREDERICK G. AUSTIN, OF-

OHIOAGO, ILLINOIS.

MIXING-MACHINE Specification of Letters Patent.

Patented Sept. 1, 1908.

Application filed December 18, 1905. Serial No. 292,190.

To all whom it may concern:

Be it known that I, WILLIAM O. STARK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use ful Improvements in Mixing-Machines, of which the following is a specification.

Objects of my invention are, to provide a mixing machine having a mixing box or receptacle involving the general principleof operation of the cubiform mixing boxes described in reissued Letters Patent to William J. Judd, No. 12,309, dated January 31, 1905, and in Letters Patent to William J. Judd, No. 781,726, dated February 7, 1905, and also involving certain improved features of construction and action not present in the mixing boxes shown and described in said patents, and also avoiding certain objectionable features incident to the cube mixing boxes shown in said patents, as hereinafter more particularly pointed out.

In the accompanying drawings. Figure 1, is a side elevation of a mixing machine embodying the principles of my invention. Fig. 2, is an end elevation of said machine. Fig. 3, is a section taken on a vertical central plane through the mixing box on line 3, 3 in Fig. 2. Fig. 4, is a section taken transversely through the mixing receptacle on a plane between its open corner ortions.

The polyhedric mixing box is revolubly mounted upon a tiltable frame B, and pro= vided with a gear 0 which is engaged by a driving gear or pinion D for the purpose 'of revolving the mixing box. The mixing box is provided with an opening for the passage of material and if desired, this opening can be used for admitting materials into the mixing box, and also for discharging a mixed-up batch. Preferably, however, the mixing box is provided with a couple of diagonally opposite openings 1 and 2, (Fig. 3)

' one of which is ordinarily used for charging the mixing box with materials, and the other employed for discharging the mixed-up batch.

The mixing box revolves about an axis passing centrally through the two openings 1 and 2, and this axis is diagonal as to the genleral interior contour of the box or receptac e.

The interior surface of the box is poly ed from plates or sheets in a workman like onal, and it is also devoid of angular pockets tending to collect and retain concrete or the like, and by forming the box as shown in the drawings, the interior angles thereof are obtuse angles in place of the right angles found in a cubiform mixing box having its sides formed by six equal squares and having all of its angles right angles. My improved.

mixing box has, however, the general action of such cubiform mixing box, and all of the advantages thereof, and in addition thereto, it involves certain other advantages not incident to a cubiform mixing box having its sides formed by six equal squares and having all of its angles right angles. The configuration of the box A is more readily described by referring to it as a cube having its eight corners equally cut away, and also having the angular portions between such corners cut away. With this arrangement the cutting away of two diagonally opposite corner portions of a hollow cube leaves two diagonally opposite openings, and these are used forthe charging and discharge openings 1 and 2. The removal of the remaining six corner portions, however, is followed by the provision of six new sides in the planes of cut, and likewise the removal of the angular portions between the corner portions is to be attended by the provision of eight'new sides in the planes of cut, whereby the box which still preserves the peculiar action of a rotary cube box arranged to revolve about a tilting axis passing through diagonally opposite corner portions, will now be a polyhedric box having twenty sides whereof there are six equal planes formed by cutting away the corners; eight equal planes formed by cutting away the angular portions between the corners, and six equal planes comprising what is left of the original six sides or side sheets of the box.

It is of course understood that in the practical manufacture, thebox can be constructmanner, and that the terms cut away or cutting away as herein employed, indicate the form of the box A as compared with a per" foot cube. The mixing box thus constructed has six side portions 3 respectively on the planes of the six sides of a strictly cube box.

t also has six side portions 4 representing planes formed; by cutting away six corner portions of a cube, and it also" has six side portions 5 and six side portions 5 representing planes formed by cutting away the angular portions extending between the corner portions of the cube. Assuming the cube to be hollow, the charging and discharge apertures are formed by cutting away diagonally opposite corner portions, the planes 'of out being illustrated by lines a and a 1n Fig.

3. Of the side portions 5 and 5 the six 'in Fig. 3, it will be seen that each plane or side portion 5 is diagonally intersected by the line of section, whereby while in Fig. 3 the sides 5 appear as rectangular planes or side portions, they necessarily appear as edge portions in Fig. 4. The six side portions 4 of the box are alternately at opposite sides of a plane transverse to the axis of rotation and intersecting the same at a point betweenthe charging and discharge openings of the mixing box, it being observed that in a mixing machine having a strictly cube box and a circular rack about the box, there will be six corners alternately at opposite sides of the ring-gear or circular rack. In my improved box, however, parts of the sides 4 representing cut away or flattened down corner portions may extend under the rmg-gear, whereby the gear can be somewhat reduced in size and held close. to a transverse plane between the open corners of the box. 7 c

As best shown in Fig. 3, the open corner portions of themixing box are provided with hollow journal portions 7 and 8 rigidcwith the box and. providing inlet and outlet mouth portions. The journal portion 7 is also provided with an annular bearing 9 and the journal Sis providedv with an annular bearing 10, the said bearing portions 9 and 10 being arranged upon anti-friction rolls on the tiltable frame 13. Two of these antifriction rolls 11 are shown in Fig. 2, it being understood that a like arrangement of anti-friction supporting rolls is resentat the opposite side of the machine. f desired,- one of the mouth pieces can be prolonged as at 12, in Fig. 1.

The mixing box thus formed has all of its interior angles obtuse angles, whereby retention of material in the angles is avoided, and

by multiplying the side portions as hereinbefore described, the materials are more rapidly and thoroughly agitated and mixed. The frame B is tilted so as to depress the discharge opening when it is desired to dump the contents of the box, and the discharge j The pinion D is fixed upon arotary shaft takes place as in the case of a cube mixing box, such discharge, however,"being'cleaner or more perfect than where a strictly cube box is employed.

13, whlch is understood to be power driven in any ordinary or suitable way, and the shaft 13 is supported by a bearing on oneof' a pair of standards E, E. The frame B is also supported to tilt upon bearings on said standards, and any known or desired means can be used for tilting such frame.

The mixing action being due to the interior surface formation of the mixing receptacle, and rotation of such receptacle, it is understood that while it is in practice desirable to form the sides 3, 4 and 5 of metal sheets or' plates secured together in any suitable mechanical way, the interior surface shown could be attained regardless ofthe exterior. configuration of the receptacle, and that thus considered, the interior plane surfaces incline to the axis of rotation. It is also. understood that an opening for the passage of materials is concentric, 'or substantially so, with such axis ,of rotation.

What I claim as my invention is:

1. In a mixing machine, a rotary mixing receptacle supported for operation about a diagonal axis and having interior plane surfaces inclined to the axis of rotation and having an opening for the passage of material concentric, or substantially so, with such axis of-rotation, the interiorcangles formed by the conjunction of the plane, surfaces beingeobtuse angles in effect produced by cutting away the corner portions ofa cube or cubiform mixing box. 1 j V.

2. Ina-mixing machine, a rotary mixing. receptacle supported for operation about a diagonal axis and having interiorplane sur-. faces inclined tothe axis of rotation and hav-, ing openings for thepa'ssage of material concentr1c,.or substantiallyso, with the axis of rotation, the interior angles formed by the. conjunction ,of the planesurfacesbeingob-, L tuse angles in effect produced by cutting away thecorners and other rectangularpore tions ofa cube or cubiform mixing box; and means for tilting said receptacle in directions to tilt its axis of rotation.

3. In a mixing machine, a rotary mixing, receptacle having interior plane surfaces corresponding with plane. sideportions formed by cutting away the corner portions and intervening angular portions of a cube, the mixing receptacle belng mounted to re volve about an axis corresponding with an axis extending between and through diagonally opposite corners of a cube, and having opposite openings for the passage of ma terial concentric, or substantially so with said axis.

7 4; In a mixing machine, a rotary polyhedric mixing box having plane side por- 1'30 tions inclined to the axis of rotation, and provided with an opening for the passage of having an annular series of plane side pormaterial concentric, or substantially so,W1th tions 5* an annular rack around the mixing its axis of rotation.

receptacle and secured upon the plane side WILLIAM O. STARK. 5 portions 5*; a driving pinion engaging the Witnesses:

annular rack, and means for tilting the mix- AUGUST BALTZER,

4 ing receptacle; said mixing receptacle being R. L. WILSON. 

